Service Provider Core

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The documents on this page pertain mostly to technologies like MPLS, iBGP, overlay technologies (like PBB-EVPN and VxLAN), Route Reflection and Confederations.

  • VPLS, PBB, EVPN and VxLAN Diagrams: These diagrams give an overview of the different overlay and L2VPN technologies currently used. Whilst not comprehensive, these diagram will help the understanding how they work and interrelate.

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  •  Pseudowire Overview: Shows an conceptual overview of what an MPLS pseudowire (or xconnect) is, as well how it is signaled.

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  • VRF Route Leaking using Import and Export maps: This documents shows how traffic passes from one VRF to another and where all the config sits, using import and export maps.

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  • SSO, GR, NSF and NSR: These terms are often  used for High Availability feature of devices in a Service Provider Core. This quick reference has been created in an attempt to clarify these often ambiguous or confusing features.

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  • BGP Route Dampening: BGP Route Dampening is commonly used in Service Provider environments to protect the core network from BGP reconvergence events caused by unstable BGP routes. This document details how it works.

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  • OSPF Sham Links: Sham links are used across Service Provider cores in scenarios whereby intra vs inter area routes might cause routing issues for OSPF in MPLS solutions. This diagram shows such a scenario and summarises the configuration of a sham link.

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  • Route Reflection Rules: A quick reference guide to the principle and rules involved in route reflection.

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  • 6to4 Tunnelling: A visual guide to 6to4 Automatic Tunnels, breaking down details like how IPv4 addresses are embedded in IPv6 addresses and how tunnels are formed.

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  • Router Tables and Databases: This diagram, whilst not exhaustive, gives an overview of the tables and databases that you would encounter when looking at a router within a service provider network. It also provides the correspoinding Cisco IOS commands.

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